.site-header {
  position: sticky;
  top: 0;
  z-index: 1030;
  background-color: rgba(255, 255, 255, 0.82);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: box-shadow 0.2s, border-color 0.2s;
}

.site-header.is-scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 6px 24px -12px rgba(15, 27, 61, 0.25);
}

.site-header .navbar {
  min-height: var(--header-height);
}

.site-header .navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--heading);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.site-header .nav-link {
  padding: 6px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-weight: 500;
}

.site-header .navbar-nav .nav-link:hover,
.site-header .navbar-nav .nav-link:focus {
  color: var(--heading);
  background-color: var(--surface);
}

.site-header .navbar-nav .nav-link.active {
  color: var(--brand);
  background-color: rgba(18, 184, 154, 0.12);
}

.site-header .navbar-account {
  align-items: center;
  gap: 8px;
}

.site-header .navbar-account .btn-link {
  color: var(--heading);
  text-decoration: none;
}

.site-header .navbar-account .btn-primary {
  padding-left: 18px;
  padding-right: 18px;
  border-radius: 999px;
}

.site-header .navbar-toggler {
  border: 0;
}

/* The collapsed menu opens as a panel under the header. */
@media (max-width: 991.98px) {
  .site-header .navbar-collapse.show {
    padding: 8px 0 16px;
  }

  .site-header .navbar-nav .nav-link {
    padding: 10px 12px;
  }

  .site-header .navbar-account {
    flex-direction: row;
    margin-top: 8px;
  }
}

.site-header:has(.navbar-collapse.show) {
  background-color: #fff;
}